The present invention provides a benzotriazole derivative compound represented by a general formula, (wherein R3 represents an alkyl group, and R4 represents an acryloyloxyalkyl group or a methacryloyloxyalkyl group), as a novel compound capable of being suitably used as a highly light-resistant ultraviolet absorber or resin composition that exhibits an ultraviolet-blocking function over a prolonged period of time and that strongly absorbs wavelengths in the ultraviolet light range of 400 nm or less while ensuring little coloration.